Question

If f(x)=−2, find f(x)=3.5x ² +x ³ .

a)−2
b) −2(3.5x ² +x ³ )
c) −2(3.5+x)
d) 3.5x² +x³

Answer 1

The correct answer is a) −2, since f(x) is defined to be -2. There seems to be a typo in the question as it gives another expression for f(x) which contradicts the initial definition. No quadratic formula is required.

Step-by-step explanation:

If f(x) = −2, we are told that the function f always equals -2, regardless of the value of x. To find f(x) when given f(x) = 3.5x² + x³, we would usually substitute x with a particular number. However, since f(x) is defined to be a constant -2, f(x) = 3.5x² + x³ does not hold in this context, so it appears to be an inconsistency or a typo in the question. Therefore, the correct answer is a) −2, as the question initially defines f(x) to be just that.

For clarification or further information on how to solve quadratic equations like ax² + bx + c = 0, you can apply the quadratic formula −b ± √(b² - 4ac) / (2a), but this formula is not applicable in the context of the question given as there is no need to solve a quadratic equation.